Frost dates for Cynthiana, KY
At Cynthiana, the median last spring frost (32°F) is Apr 18 and the median first fall frost is Oct 23, for a typical growing season of 188 days. For a 90% chance that the last frost has passed, wait until May 5. Nearby ZIP codes are in USDA hardiness zone 6b.
- Apr 18Last spring frost (median)50% chance of 32°F after this date
- May 5Safer planting date10% chance of 32°F after this date
- Oct 23First fall frost (median)50% chance of 32°F by this date
- 188 daysGrowing season (median)between 32°F freezes
Last spring frost dates
The chance that the temperature drops to the threshold after each date.
| Temperature | 90% chance later | 50% chance later | 10% chance later |
|---|---|---|---|
| 36°F | Apr 14 | Apr 29 | May 15 |
| 32°F | Apr 2 | Apr 18 | May 5 |
| 28°F | Mar 20 | Apr 5 | Apr 23 |
| 24°F | Mar 6 | Mar 24 | Apr 10 |
First fall frost dates
The chance that the temperature has dropped to the threshold by each date.
| Temperature | 10% chance by | 50% chance by | 90% chance by |
|---|---|---|---|
| 36°F | Oct 1 | Oct 14 | Oct 25 |
| 32°F | Oct 13 | Oct 23 | Nov 4 |
| 28°F | Oct 22 | Nov 2 | Nov 16 |
| 24°F | Nov 1 | Nov 13 | Dec 1 |
Growing season length
Days between the last spring and first fall freeze, as the length reached in 9, 5 and 1 out of 10 years.
| Temperature | 9 in 10 years at least | 5 in 10 years at least | 1 in 10 years at least |
|---|---|---|---|
| 36°F | 149 days | 168 days | 185 days |
| 32°F | 167 days | 188 days | 208 days |
| 28°F | 190 days | 211 days | 232 days |
| 24°F | 211 days | 233 days | 260 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 100% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 41031 | 6b | -5 to 0°F | 4 km |
| 40348 | 6b | -5 to 0°F | 16 km |
| 41003 | 6b | -5 to 0°F | 19 km |
| 40370 | 6b | -5 to 0°F | 20 km |
| 40361 | 6b | -5 to 0°F | 21 km |
| 41064 | 6b | -5 to 0°F | 26 km |
Not the official USDA Plant Hardiness Zone Map. Zones shown here are the values published in the USDA-ARS / Oregon State University PRISM Group 2023 ZIP code tables, shown unaltered. For the official interactive map, visit planthardiness.ars.usda.gov.
About this station
- NOAA station ID USC00151998, at 38.3769, -84.3031, elevation 213 m (700 ft).
- Data quality: Standard (24+ years of data), 26 years of freeze data.
- Average days per year at or below 32°F: 109.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Williamstown (37 km)
- Lexington Bluegrass Airport (46 km)
- Mount Sterling (48 km)
- Versailles 3 NNW (50 km)
- Flemingsburg 2 N (50 km)
- Augusta 2 (50 km)
- Frankfort Capital City Airport (57 km)
- Maysville Wastewater Plant (57 km)
Sources
- NOAA National Centers for Environmental Information, U.S. Climate Normals 1991–2020, annual/seasonal normals by station (version 1.0.1), file dated June 27, 2023; documentation.
- USDA Agricultural Research Service and PRISM Group, Oregon State University, 2023 Plant Hardiness Zone Map ZIP code tables (CONUS, Alaska, Hawaii, Puerto Rico), files dated November 17, 2023. Data © PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed November 1, 2026. Official map: planthardiness.ars.usda.gov.
- U.S. Census Bureau, 2024 Gazetteer ZIP Code Tabulation Areas file, dated August 30, 2024 (ZIP centroids used to find the nearest station).
Freeze dates are 30-year probabilities, not forecasts. Check your local forecast before planting tender plants.